Moving my email hosting to Zoho

Moving my email hosting to Zoho

Can someone refresh my memory?  Zoho already hosts my email for my personal domain name FredJClaus.com.  I have a company domain name at HuskyLogic.com and would like to move my email away from my current website host and over to Zoho.  Can someone tell me how to set it up?

I've tried to set up a new hosting account at it tells me 2 errors

1. This domain is not valid.
2. The email address already exists for my contact address  (using Fred@FredJClaus.com)

Is there instructions for moving a second domain over to Zoho?